“This is extraordinarily heartbreaking news I’m about to give to you,” said Santa Cruz Police Chief Kevin Vogel during a late-night press conference. “This evening at approximately 7:55 p.m. … our detectives discovered the body of a young female inside of a dumpster at the complex located behind me.”

On top of tearing apart a family, the grim revelation is also roiling a once tight-knit community.

That’s because the person taken into custody for questioning in the still mysterious child slaying is a 15-year-old boy — a 15-year-old boy who lived in the same complex as Maddy. “We have arrested and taken into custody a 15-year old male who was on the property at the time of the discovery,” Vogel told reporters. He has not been charged with a crime.

It’s a cruel twist for a community that had been looking outside for answers, only to find one within.

“We all had this idea that she had been taken from the site,” neighbor Jeannie Cartabiano told The Washington Post in a phone interview late Monday night.

“That’s what’s so shocking,” she said. “To find out that” that it might be “one of our own is shocking. That she was at the site this whole time is shocking. The whole thing is hard to comprehend.”

Cartabiano did not identify the 15-year-old. Neither did police. Local news stations aired footage of the boy’s mother wailing as her son was taken into custody for questioning on Monday night, but blurred out the minor suspect’s image.

Much else remains blurry, at least for the time being. How did Maddy die, for instance. And, perhaps most important of all, why?

What is already clear, however, is that her community, which banded together to search for Maddy, is showing strains and assigning blame now that her body has been found.

“As heinous as this was, we felt like a cohesive community” at first, Cartabiano told The Post. But something had broken with the discovery of Maddy’s body and the boy’s arrest.

“Quite frankly, I think this is going to pose lots of questions about our community internally,” she said. “You can’t look at this without asking: how could this happen?”

The community in question is the Tannery Arts Center, a gleaming new $55 million mixed-use complex that seemed like the last place something like this would happen.

The artists’ colony was one of Santa Cruz’s shining achievements. Its saga began in 2001, when America’s last operating tannery, Salz Leather, shut down. Surrounded by other industrial and commercial buildings, some of them similarly abandoned, the old Salz factory became a public eyesore.

“If you walked around the site a couple of years ago, on the spot of the defunct Salz Tannery on the Highway 9 side of River Street, you would have sworn you were looking at a relic of a forgotten Nevada mining town,” the Santa Cruz Sentinel wrote. “The place was fenced up, but it was so dilapidated and scary-looking that a ‘Keep Out’ sign hardly seemed necessary.”

In 2004, however, the Santa Cruz Redevelopment Agency approved a plan to turn the 150-year-old factory into a mix of artists’ lofts and affordable housing for artists and their families. The agency provided $1.9 million, with the vast majority of the project coming from state or federal housing grants and Artspace, the Seattle nonprofit that built the project.

Somehow, the project survived local politics and California’s budget crisis.

By the time Maddy and other residents moved into the Tannery Arts Center’s 100 affordable housing units in late 2008, the eight-acre complex including a café and a dance studio. In the years since, its private studios have filled up. A literary magazine moved in. So did notable art galleries. Residents started a garden. And a 200-seat theater is scheduled to open later this year.

Developers billed the TAC as a “first-in-the-nation art community that provides a sustainable, accessible and vibrant home for the arts in Santa Cruz County.”

Politicians boasted about helping to build it.

Privately, however, Tannery residents complained that the city wasn’t doing enough to protect the arts campus, which still sat in a questionable neighborhood.

“It’s a lot of hard work,” said Cartabiano. “We’re a place of transformation. We have a very cohesive vision but if you know anything about our area, we are located in a commercial/industrial zone. There is heavy drug trafficking going on around us. It’s just never ending. It’s getting better bit by bit, but it’s still there.”

And so it was that when Maddy Middleton went missing on Sunday, the search quickly escalated from the Tannery to the surrounding neighborhood and then to all of Santa Cruz.

Some blamed the city’s sizable homeless population.

“Are we still going to allow all the drifters and fugitives to sleep and live long term here?” asked one man in the comments section of an article about Maddy’s disappearance. “Are we going to continue to allow them to camp by the river, in view of the Tannery, further jeopardizing public safety? Do you still want to help the homeless? If we find out this was a transient that had been living down there what should be the reaction? I pray they find here before any more harm is done.”

A search and rescue team from the Santa Cruz County Sheriff office listen to tips from a citizen Monday, July 27, 2015, in Santa Cruz, Calif. Police and volunteers were searching Monday for a missing 8-year-old girl a day after she vanished from a Northern California artist community center where she lives with her mother. Madyson Middleton was last seen Sunday afternoon riding a scooter outside the Tannery Arts Center in Santa Cruz, a beach town along the Northern California coast. (AP Photo/Ben Margot)

Police interviewed the complex’s residents: once, twice, then a third time. The FBI was called in to assist. The search soon expanded to the San Lorenzo River and up and down the coast.

“This is our town, and this just shouldn’t happen here,” volunteer David Giannini told the AP. “We all should do everything we can to find this girl.”

But when a break came in the case, it came from within.

On Monday night, roughly 24 hours after Maddy’s disappearance, a SCPD detective found her body in a trash dumpster at the Tannery Arts Center.

“We actually had people look in this area so I don’t know [how we missed her],” said Cartabiano, who, like her neighbors, had assisted in the search. “I don’t want to get too graphic but I imagine that she was really hidden.”

As detectives marked off the crime scene, cops also detained a 15-year-old Tannery resident.

Our hearts are broken and our deepest sympathy to the family of Madyson Middleton. We are grieving with the entire Santa Cruz community.

“We love this guy. All of us if you ask us what you think of him we’d tell you he’s an outstanding kid,” she said. “He was always in there to help with environmental cleanup. He was our poster child.”

“I’ve known him for a long time. He was a nice kid,” Terrence Keller, another neighbor, told NBC Bay Area. “He was very well spoken for his age. He was seemingly a nice guy. So it’s a very unfortunate circumstance, to say the least.”

According to Cartabiano, the two children — victim and alleged killer — were close.

“They were great friends, that’s what makes it so ludicrous,” she told The Post. “I’m shocked. I’m numb.”

Police haven’t said how Maddy died or what motive the 15-year-old suspect might have had. Santa Cruz Police have said they will hold a press conference on Tuesday morning.

Without many firm answers, Cartabiano and her neighbors have been left to guess at what could have turned their artist colony into a crime scene.

“We heard that it was possibly a horrible accident, that something went all wrong,” she said, suggesting that multiple kids could have been involved. “Whoever it was was young enough to be frightened and tried to hide the scene.”

Santa Cruz Police Chief Kevin Vogel said the 15-year-old in custody was being treated as a homicide suspect.

“It’s horrible. It’s awful. It’s heartbreaking,” he told local TV station KSBW. “The last time I stood in front of a group like this was when my officers were killed. And it feels just like it did that night.”

Whatever happened that night, the death is raising questions about the community Cartabiano felt so close to just 24 hours ago.

“We are confounded why they wouldn’t go to their parents or go to the office,” she said of the suspect or suspects. “There are so many of us here to support them.”

Cartabiano said the community could go in one of two ways after the killing: it come together or fall apart.

“I am trying to feel optimistic about it, but we have a huge challenge in front of us, and that is to heal from this,” she said.

“It is amazing how resilient a community can be,” she said before hesitantly adding, “if we do stick together.”